Datang: Signed in for Seven Years and Was Exposed by Empress Changsun

I just want to see how to use tofu water to filter poisonous salt.

Seeing the untreated poisonous salt, Li Hong called for help.

When salt is first mined, it comes in all shapes and sizes.

These salts have to go through preliminary treatment before they can be purified and filtered.

First, crush the salt.

In ancient times, there was no special machine for processing salt, so it could only be crushed manually.

As a result, these salts are very coarse. In ancient times, people ate coarse salt.

And it's yellowish, not white and thin like the salt of later generations.

But this does not affect the purification, so he asked someone to crush the salt as much as possible.

After smashing, it is to drive out impurities, that is, to put salt in a pot and boil it with water.

For things like salt, no matter how they are boiled and dried in the sun, salt-like crystals will appear.

And this step of cooking can cook out the impurities attached to the salt, but it can't cook out toxic substances.

Everyone watched Li Hong cook and drain in the hall, very busy.

When the salt was completely boiled, Li Hong filtered the salt with gauze.

Because the salt is dissolved in water, the impurities that cannot be dissolved in water will be filtered by gauze.

The salt that has just been mined is indeed very dirty, and many dirty things have been boiled out.

Filter it with gauze, and it is covered with dense dirt.

Filtered salt can only be said to be relatively clean, but it is absolutely inedible.

There are a lot of poisonous substances in these brines, and people can die if they just touch a little.

After the first step removes impurities, the brine becomes much clearer.

The ancient people did not have this step, when they saw Li Hong put salt into the pot and add water to boil.

For a while, I was a little confused about what he was going to do, but I didn't understand when I saw him filter it with gauze.

They don't understand, precisely because they didn't do this step.

Therefore, the ancient salt was somewhat yellowed, and the color was very ugly.

Because there are too many impurities in it, even if the salt is purified later, the salt will turn yellow.

Immediately afterwards, everyone saw Li Hong pouring the salt water into the pot again to cook.

After boiling, it was filtered again until no impurities could be filtered out.

Then, pour the salt water into the red boiling pot.

The fire has been boiled until the water is boiled dry.

Changsun Wuji was puzzled, "General Li, you boiled the salt with water, is there any salt left?"

Someone wanted to ask this question a long time ago, but never dared to ask it.

Even Li Shimin looked at him in surprise, now there is only a pot of water left, what should I do if there is no salt?

Li Hong smiled, "The salt will come out later."

After speaking, he continued to increase the firepower.

Let the whole palace feel a little hot, especially in this weather.

It made a group of ministers so hot that they wanted to find a fan and fan themselves well.

The longer it cooks, the more uncomfortable it is for everyone.

I can't leave yet, because we are discussing major issues of people's livelihood now.

Just when Li Shimin wanted to urge him to finish the work, he suddenly found out.

The water was slowly boiled dry, and the pot was covered with a layer of white crystals.

Until the water was completely boiled dry, a large piece of crystals was deposited on the bottom of the pot.

It was the first time for everyone to see such a snow-white salt-like crystal, and they couldn't help but exclaimed.

"Is this salt?"

"It's amazing, the salt came out again, what kind of spell is this?"

"I didn't expect the salt to melt into the water, and it could be boiled out."

"..."

Li Hong also laughed when he saw this thick layer of crystallization, "It's finally boiled out, it would be great if the firepower could be stronger."

But what everyone is most concerned about is whether this snow-white salt can be eaten?

Chapter 183 Awarding Salt Fields

Of course Li Shimin also had this question, "Li Hong, is the salt like this all right?"